Java 中 PrintWriter close()方法，带示例
原文:https://www . geesforgeks . org/print writer-close-method-in-Java-with-examples/
Java 中 PrintWriter 类的 close() 方法用于关闭流。关闭流会释放流中的任何值或与之关联的任何资源。PrintWriter 实例一旦关闭就不起作用了。此外，PrintWriter 实例一旦关闭，就不能再次关闭。
语法:
public void close()
参数:该方法不接受任何参数。
返回值:此方法不返回值。它只是关闭了流。
下面的方法说明了 close()方法的工作原理:
程序 1:
// Java program to demonstrate
// PrintWriter close() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
// The string to be written in the Writer
String str = "GeeksForGeeks";
try {
// Create a PrintWriter instance
PrintWriter writer
= new PrintWriter(System.out);
// Write the above string to this writer
// This will put the string in the stream
// till it is printed on the console
writer.write(str);
// Now close the stream
// using close() method
writer.close();
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
GeeksForGeeks
程序 2:
// Java program to demonstrate
// PrintWriter close() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
// Create a PrintWriter instance
PrintWriter writer
= new PrintWriter(System.out);
// Write the char to this writer
// This will put the char in the stream
// till it is printed on the console
writer.write(65);
// Now close the stream
// using close() method
writer.close();
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
A
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